Must be nice to return to your hometown after a few years and find your osananajimi there who is all grown up since last time and also has been waiting for you all this time because of a promise made that she'd marry you and be your wife?
Great ending though...Even if the parents find out I'm sure they'd just laugh it off and celebrate later that night.
She took what was rightfully hers and will never let go! Not that he seems dumb enough to try to get away from her (although this would make a nice yandere sequel chapter...)...